Paper cutter



c. H. RICHARDSON' l PAPER CUTTER June 11, 1940.

Filed Jan. 26, 1939 @gage/2507,'

Patented June llf, 1940 UNITED j STATES QFFICE 2 Claims.

This invention relates to paper cutters and `particularly to a small, light machine suitable for cutting all manner of designs and shapesin cardboard, paper and the like, as would be used for posters, show cards, window displays, stereotype casting forms and various other similar uses in industrial and graphic arts.

The particular object of the invention is to provide a small, light, safe, inexpensive paper cutter for broad, general acceptance and usage.

Another object is to provide a paper cutter that has guide means for cutting various sizes of circles and for straight lines and a protective glass needle shield to assist the operator in the use of the cutter.

Other objects and benets will be disclosed in the following description and drawing in which:

Fig. 1 is a front elevation View of my paper cutter, showing the needle drive mechanism in dotted outline;

Fig. 2 is a side elevation view with the base member in section as it would appear on the section lines 2-2 of Fig. 1;

Fig. 3 is a bottom plan view, showing the circle cutter device` in its relation to the glass needle shield; and

Fig. 4 is a broken sectional view of the circle cutter pivot device las it would appear on the section lines 4-4 of Fig. 3.

Now referring to the drawing, the cutter mechanism is mounted on a base I0 having a sole plate II attached to it by screws, as shown in Fig. 3. A small high-speed motor I2 is mounted on the base by means of through frame screws I3, as well shown in Fig, 2.

An electric service cord I4 leads through the base of the motor to a button switch I5 which controls the ow of current and the operation of the cutter.

The motor I2 has a shaft I6 which extends on both sides of the motor frame, as well shown in Fig. 2. The inner shaft extension has an eccentric shaft I1 mounted on it and in the shaft I1 is an eccentric pin I8 which fits in a cross slot I8 of an eccentric block I9 slidably mounted in a frame opening, as shown in Figs. l and 2. Attached to the eccentric block I9 is a reciprocating chuck bar 2U slidably mounted in the frame I0. On the end of' this chuck bar is a conventional clamp chuck ZI designed to accommodate the cutter needle 22 held therein. This cutter needle as I use it is an ordinary phonograph needle easily available at low cost.

The cutter needle 22 extends through a guide hole in a glass needle shield 23 held in position by the sole plate I I. It will readily be appreciated that this glass needle shield serves a very useful purpose in permitting the operator to see the line of work, and furthermore, it holds down the paper as it is being cut and thereby enables the needle to cut a iine sharp line. Moreover, the point of the needle extending through the hole in the glass shield protects the operator from any accidental injury from the reciprocating needle because the short stroke of the needle does not permit it to extend above the shield.

It will be understood that the glass used in the needle shield will be of the safety or nonshatterable type. It will also be understood that transparent materials, such as Celluloid or phenolic resin products, may be used. However, glass is preferable because of its ability to withstandscratching and retain its transparency.

In order to provide means to adjust the needle to any thickness of work a knob 24 is xed to the outer end of the motor shaft. By means of this knob the operatormay turn the motor and reciprocate the chuck bar and thus enable the operator to see the exact depth to which the needle is set.

Now referring to Fig. 2, it will be noted that a center point 25 threaded through a clamp bar 26 extends below the lower surface of the sole plate II, and it will readily be appreciated that when the center point is in this position it will enable the operator to rotate the cutter and cut a perfect circle as controlled by the radial distance between the center point 25 and the needle 22.

Now referring to Fig. 3, it will be seen that this clamp bar 26 is slidably fixed to the sole plate II by means of two screws 21 and 28 carried through slotted openings 29 and 30, respectively, and that the center point 25 extends through a companion slotted opening 3l. By loosening the screws 2l and 28, the needle point may be slido ably adjusted to any point withinthe range of the slotted openings, and thus means is provided to adjust the center point to cut any desired diameter of circle within this range. These diameters may be readily set by the operator by means of the scale 32 adjoining the slotted opening 3|. It will be appreciated that when the circle cutting device is not needed, the center point 25 may be screwed upwardly in order to carry the point above the level of the base plate II.

By referring to Fig. 3, it will be noted that one side of the base has a straight edge 33, the purpose of which is to provide means whereby the operator may hold this straight edge against a ruler and by moving the cutter along the ruler the needle Will cut a straight line. From the above description it will be Well understood that v means is provided on the base whereby the operator may cut circles of various diameters and straight line cuts.

Having thus described my invention, li claim:

1. A paper cutter including a base, a motor mounted on said base, reciprocating driving means on one end of said shaft, a reciprocating chuck bar driven by said driving means, a cutting needle in said chuck bar, and a glass needle shield in said base, said shield being of suicient thickness to fully encompass the needle in its entire reciprocating movement.

2. A paper cutter including a base, a motor circles of various diameters may be cut by the 10 needle.

CLARENCE H. RICHARDSON. 

